Danfoss R22 Scroll Refrigeration Compressor -MLZ019T5LP9 MLZ021T5LP9 MLZ026T5LP9 MLZ015T4LP9 MLZ019T4LP9 MLZ021T4LP9

I. Positioning

II. Full Series Parameter Comparison Table

Cooling capacity data based on 50Hz, standard ARI medium-temperature conditions.

• LP9: Standard brazed connection, applicable to small and medium displacement models in Group 1 and Group 2.

  
  

• LC9: Large displacement optimized brazed connection, applicable to large displacement models in Group 3, with different interface dimensions and mounting hole patterns.

  
  

III. Detailed Analysis

Group 1: T5 Single-Phase Medium-Temp Series (2.5~3.5HP)

Feature 1: Single-Phase Power Supply Design

• Feature: Adopts 220-240V/1/50Hz single-phase power supply; "T5" in the model is the single-phase motor voltage code.

  
  

• Advantage: No need for three-phase power configuration; simple installation wiring reduces electrical ancillary costs. Single-phase motors run in one direction only, eliminating the risk of phase reversal found in three-phase motors, thus no need for a phase sequence protector.

  
  

• Benefit: Especially suitable for installation environments without three-phase power supply, such as small shops and community cold storage rooms, helping customers save on electrical renovation costs and shortening project delivery cycles.

  
  

Feature 2: Wide Refrigerant Compatibility

• Feature: Fully compatible with nine or more refrigerants including R404A, R407C, R507A, R452A, R134a, R513A, R22, R448A, R449A.

  
  

• Advantage: One compressor platform meets refrigerant requirements for different regions and regulations, usable from traditional HFC refrigerants to low-GWP environmentally friendly alternative refrigerants.

  
  

• Benefit: Reduces inventory management complexity, facilitates equipment export to different regulatory regions, reserves space for future refrigerant transitions, and protects customer investment.

  
  

Feature 3: Compact and Lightweight Design

• Feature: Net weight of approx. 31kg, oil charge of only 1.06L, adopting a slender barrel structure.

  
  

• Advantage: Small installation footprint, easy to integrate into compact condensing units; light weight reduces transportation costs and installation labor.

  
  

• Benefit: Provides spatial advantages for equipment miniaturization, lowers logistics costs and on-site installation difficulty, especially suitable for retrofit projects with limited space.

  
  

Feature 4: Built-in Motor Protection

• Feature: Equipped with a built-in overload protector; MCC (Maximum Continuous Current) is 23A, with precisely controlled locked rotor current.

  
  

• Advantage: Automatically protects motor windings under abnormal voltage or overload conditions to prevent burnout; no external protection module required, simplifying system design.

  
  

• Benefit: Extends compressor service life, reduces after-sales failure rates, and cuts maintenance costs.

  
  

Feature 5: Low-Noise Scroll Structure

• Feature: Adopts scroll compression principle, no suction/discharge valve plate structure, combined with disc-type check valve design.

  
  

• Advantage: Eliminates pulse noise at the source, operates smoothly with extremely low vibration.

  
  

• Benefit: Suitable for installation near work areas or residential areas, no additional sound insulation measures needed, reducing overall system costs.

  
  

Group 2: T4 3-Phase Medium-Temp Small Displacement Series (2~3.5HP)

Feature 1: 3-Phase Wide Voltage Adaptability

• Feature: Supports dual-frequency and dual-voltage operation at 380-415V/3/50Hz and 460V/3/60Hz. "T4" in the model is the 3-phase motor voltage code. Voltage range is 340-457V at 50Hz and 414-506V at 60Hz.

  
  

• Advantage: One compressor covers mainstream global industrial power grids; voltage adaptation range is as wide as ±15%, effectively coping with grid fluctuations.

  
  

• Benefit: Facilitates equipment export; the wide voltage range reduces downtime caused by unstable power grids. Three-phase motors offer better power factor and operating efficiency than single-phase motors, resulting in lower power loss under continuous operation.

  
  

Feature 2: Continuous Wide Displacement Coverage

• Feature: Continuously covers four displacement levels from 2HP (MLZ015) to 3.5HP (MLZ026), with displacement from 33.8cm³ to 57.1cm³.

  
  

• Advantage: Provides flexible selection space for different cooling capacity requirements, covering approx. 3.1kW to 5.3kW.

  
  

• Benefit: Customers can precisely match actual loads, avoiding energy waste from "over-sizing," while reducing compressor model variety and simplifying spare parts management.

  
  

Feature 3: A2L Refrigerant Support (R454C/R455A)

• Feature: In addition to conventional refrigerants, the T4 series is also compatible with A2L mildly flammable environmental refrigerants such as R454C and R455A.

  
  

• Advantage: Complies with EU F-gas regulations and global low-GWP refrigerant trends, reducing GWP by approx. 70%~90% compared to R404A.

  
  

• Benefit: Helps customers complete refrigerant compliance layout in advance, avoiding equipment obsolescence risks due to regulatory changes, and supporting carbon neutrality goals.

  
  

Feature 4: 3-Phase Electrical Characteristic Optimization

• Feature: LRA (Locked Rotor Current) for 3-phase models is 45A, MCC is 9.5~11A, with precisely matched winding resistance.

  
  

• Advantage: Small starting current impact, low requirements on grid capacity; good three-phase winding symmetry and balanced operating current.

  
  

• Benefit: Reduces requirements on distribution systems and lowers electrical ancillary costs; extends motor life and reduces additional losses caused by current imbalance.

  
  

Group 3: T4 3-Phase Medium-Temp Large Displacement Series (4~7.5HP)

Feature 1: Large Cooling Capacity Single-Unit Output

• Feature: Covers five displacement levels from 4HP (MLZ030) to 7.5HP (MLZ058), with single-unit cooling capacity reaching approx. 6.8~11.7kW and displacement of 68.4~117.0 cm³.

  
  

• Advantage: A single compressor meets the total cooling demand of small/medium cold storage or supermarket freezing/refrigeration systems, reducing the number of parallel compressors.

  
  

• Benefit: Simplifies system piping and control design, lowers installation complexity and failure points, reduces footprint, and saves overall engineering costs.

  
  

Feature 2: LC9 Large Displacement Optimized Interface

• Feature: Uses "LC9" suffix, a brazed connection configuration exclusive to large displacement models, with enlarged interface dimensions and mounting holes compared to LP9 models.

  
  

• Advantage: Pipe connection size matches larger cooling capacity, reducing pipe pressure drop and improving overall system efficiency.

  
  

• Benefit: Ensures smooth refrigerant flow under large cooling capacity conditions for better system energy efficiency, while providing more ample piping connection space for engineering installation.

  
  

Feature 3: Wide Temperature Zone Adaptability

• Feature: Suitable for both medium-temperature (MT) and high-temperature (HT) refrigeration applications, with ambient temperature adaptation range up to -35℃ to 55℃.

  
  

• Advantage: One compressor covers multiple refrigeration conditions, from cold storage rooms to pre-freezing stages.

  
  

• Benefit: Reduces customer procurement needs for multiple compressor specifications and simplifies equipment configuration; wide temperature zone design ensures stable operation under extreme climatic conditions.

  
  

Feature 4: High-Efficiency Scroll Compression Design

• Feature: Adopts Danfoss patented asymmetric scroll profile, combined with optimized pressure ratio design and high-efficiency motor.

  
  

• Advantage: Achieves high-efficiency operation under normal medium-temperature refrigeration conditions, reducing energy costs; optimized pressure ratio is specifically matched to refrigeration application requirements.

  
  

• Benefit: Significantly reduces annual operating electricity bills for cold chain facilities while cutting carbon emissions, meeting green cold chain certification requirements.

  
  

Feature 5: POE Refrigeration Oil & System Compatibility

• Feature: The entire series uses POE (Polyolester) refrigeration oil, compatible with R404A, R134a, R513A, R448A, R449A, and other refrigerants.

  
  

• Advantage: POE oil has good chemical stability with environmentally friendly refrigerants and excellent lubricating performance, maintaining reliable oil film strength even under high compression ratio conditions.

  
  

• Benefit: Extends compressor service life and reduces oil change frequency; no need to change lubricating oil when switching refrigerants, lowering system upgrade costs.

  
  

Feature 6: Low-Noise Operation

• Feature: The scroll compression structure inherently offers low noise advantages, combined with precise dynamic balance correction.

  
  

• Advantage: Even at 7.5HP large displacement, operating noise is significantly lower than semi-hermetic reciprocating compressors of the same cooling capacity.

  
  

• Benefit: Suitable for cold storage projects near work areas or residential areas, eliminating the need for additional soundproof engine rooms and saving civil construction investment.

  
  

IV. Application Quick Selection Guide

V. Frequently Asked Questions (FAQ)